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Home Chemical Engineering Process Control and Instrumentation Comments

  • Question
  • Mercury manometer (U-tube type) exemplifies a __________ order system.


  • Options
  • A. zero
  • B. first
  • C. second
  • D. third

  • Correct Answer
  • second 


  • Process Control and Instrumentation problems


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    • 1. Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?

    • Options
    • A. Nickel
    • B. Brass
    • C. Chromel
    • D. Invar
    • Discuss
    • 2. Characteristic equation is the denominator of __________ loop transfer function.

    • Options
    • A. open
    • B. closed
    • C. both (a)and (b)
    • D. neither (a) nor (b)
    • Discuss
    • 3. Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.

    • Options
    • A. radiation
    • B. optical
    • C. photoelectric
    • D. none of these
    • Discuss
    • 4. Emission spectroscopy is used for

    • Options
    • A. solids and metal analysis.
    • B. determining water purity.
    • C. determination of CO2 in gases.
    • D. NOxdetermination.
    • Discuss
    • 5. Thermal conductivity measurement is used for the determination of

    • Options
    • A. O2 percentage in the flue gas.
    • B. specific gravity of petrofuels.
    • C. composition of an alloy.
    • D. CO2 percentage in the flue gas.
    • Discuss
    • 6. Which is the most suitable instrument for measuring pressure below 3 microns?

    • Options
    • A. Mcleoid gauge
    • B. Alphatron
    • C. Ionisation gauge
    • D. Bourdon guage
    • Discuss
    • 7. Polarisation of light forms the working principle of a

    • Options
    • A. polarimeter
    • B. polarograph
    • C. chromatograph
    • D. spectrometer
    • Discuss
    • 8. Working principle of radiation pyrometer is based on the

    • Options
    • A. Wien's law
    • B. Kirchoffs law
    • C. stefan-Boltzman law
    • D. Seebeck effect
    • Discuss
    • 9. Flow rate through an orifice is __________ the pressure differential.

    • Options
    • A. proportional to
    • B. inversely proportional to the square root of
    • C. proportional to the square root of
    • D. inversely proportional to the square of
    • Discuss
    • 10. Bode stability method uses __________ loop transfer function.

    • Options
    • A. open
    • B. closed
    • C. either (a) or (b)
    • D. neither (a) nor (b)
    • Discuss


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